UNC Thread gauges plug and ring UUNNCC American unified coarse thread UNC, ANSI B-1.1 600 P Gauge dimensions ANSI/ASME B1.2 Symbol MSBg MSBg MSRh MSRk Typ GO / NOGO GO / NOGO GO NOGO Tolerance Tol 22BB 33BB 22AA 2A UNC Ć d1 1”/P INDEX S3-302186 S3-302187 Y3-412182 Y3-422182 No 5 - 40 3,175 40 4105 No 6 - 32 3,505 32 4106 No 8 - 32 4,166 32 4108 No 10 - 24 4,826 24 4110 No 12 - 24 5,486 24 4112 1/4 - 20 6,350 20 4127 5/16 - 18 7,938 18 4128 3/8 - 16 9,525 16 4129 7/16 - 14 11,112 14 4130 1/2 - 13 12,700 13 41319/16 - 1214,2881241325/8 - 1115,875114133 6 3/4 - 10 19,050 10 4135 7/8 - 9 22,225 9 41371-825,400841391.1/8 - 728,57574141 8 1.1/4 - 7 31,750 7 4143 1.3/8 - 6 34,925 6 4145 1.1/2 - 6 38,100 6 4147 1.3/4 - 5 44,450 5 4151 2 - 4.1/2 50,800 4.1/2 4155 i GO gauges above 1 ¾” - UNC are called MSCh and NO GO MSCk and they are produced with separate handle Example of order Available from stock S3-302187-4127 On request 221 MSBg 1/4-20 UNC-3B